Concernig the flow direction (return and supply) it is important to review the mounting position (port "1" and "2"). Rotating around the lateral axis of the variant TT+TT and AA+BB the flow direction of the multipurpose valve body CETOP 5 will change from 1 to 2 and from 2 to 1 (see symbol). For variant AA and BB rotaing around the lateral axis not only the flow direction will change as above mentioned. As well the channel will change: e.g. A will change to B and B to A.